Depression

What is depression?

Depression is a mood disorder that brings a lasting low mood and a loss of interest in things you used to enjoy, along with changes in how you sleep, eat, think, and get through the day. It is different from ordinary sadness because it sticks around nearly every day for at least two weeks and involves more than feeling down. It is also one of the most common mental health conditions, affecting about 7% of U.S. adults each year and roughly 1 in 6 people at some point in life.

Depression can affect anyone, at any age, though it is more common in women, partly because of hormonal changes across the lifespan. It often shows up alongside other conditions, and sometimes there is no obvious reason for it at all.

Depression is really an umbrella term for several related conditions. The two most common are major depressive disorder and persistent depressive disorder. Major depressive disorder, often just called clinical depression, brings more intense symptoms that last at least two weeks. Persistent depressive disorder, once known as dysthymia, is milder but lingers far longer, usually for at least two years. Naming which pattern fits helps a provider match you with the right care.

What are the symptoms of depression?

Depression looks different from one person to the next, and it does not always show up as obvious sadness. Symptoms tend to be present most of the day, nearly every day, and they affect both the mind and the body. They generally fall into two groups.

Emotional and cognitive symptoms shape your mood and the way you think.

• A low, hopeless, or worried mood that lingers most of the day
• Losing interest or pleasure in things you used to enjoy
• Feeling easily irritated or frustrated
• Trouble concentrating, making decisions, or remembering things
• Thoughts of self-harm or suicide

Physical and behavioral symptoms show up in your body and your daily habits.

• Sleeping too much or too little
• Eating much more or much less than usual
• Feeling very tired or low on energy
• Aches, pains, headaches, or digestive problems with no clear cause
• Withdrawing from family and friends, or increasing your use of alcohol or drugs

Symptoms can also shift with age and sex. Children often seem irritable, and men may show anger or withdrawal that masks the low mood underneath. If several of these signs have lasted more than two weeks, it is a good idea to check in with a professional.

Who is at increased risk for depression?

There is no single cause of depression. Most experts describe it as the result of genetic, biological, environmental, and psychological factors working together, and sometimes there is no clear trigger at all. Knowing the common risk factors can help you understand your own situation, even though having them does not make depression inevitable.

Biological factors

• A family history of depression; having a first-degree relative with it makes you about three times more likely to develop it
• Differences in brain chemistry involving messengers such as serotonin and dopamine
• Ongoing medical conditions such as chronic pain, diabetes, or heart disease

Life and environmental factors

• Stressful or traumatic events, such as the loss of a loved one, divorce, or isolation
• Being a woman, partly due to hormonal changes during menstruation, pregnancy, and menopause
• Living with another mental health condition, such as an anxiety disorder

Depression can also arise with no obvious trigger, and experiencing it is not a reflection of personal weakness. Understanding your risk factors is simply a way to notice patterns earlier.

How is depression treated?

Depression is one of the most treatable mental health conditions, and roughly 80% to 90% of people who seek treatment respond well. Most plans combine talk therapy, medication, or both, tailored to the type and severity of your symptoms. The options below are common starting points to discuss with a provider.

Cognitive behavioral therapy (CBT) is the most widely used talk therapy for depression. It helps you notice and reshape the negative thought patterns that keep low mood going, and it often includes small, structured steps back toward activities you have dropped.

Interpersonal therapy (IPT) focuses on how relationships and life changes affect your mood. It was originally developed to treat depression, and it helps you work through grief, role transitions, and conflicts while strengthening your support network.

Medication in the form of antidepressants can help rebalance the brain chemistry involved in depression. It can take a few weeks to feel the effect, and it sometimes takes more than one try to find the right fit, so it helps to stay in regular contact with your prescriber.

Brain stimulation therapies are options when depression is severe or has not responded to other treatments. Approaches such as electroconvulsive therapy (ECT) and transcranial magnetic stimulation (TMS) can help when symptoms are hard to shift, and a provider can explain what each one involves.

Everyday support can strengthen treatment, even though it rarely replaces it. Regular exercise, steady sleep, time with people you care about, and easing off alcohol can all support your recovery.

The right combination is personal, and it is common to adjust course over time as you learn what helps most.

When should you seek help?

It is a good idea to reach out to a professional as soon as you notice symptoms, before they have a chance to deepen. Consider making an appointment if low mood, loss of interest, or changes in your sleep and appetite have lasted more than two weeks and are affecting work, relationships, or daily routines. It also helps to talk to someone if you are leaning on alcohol or drugs to cope, or feel more irritable or withdrawn than usual.

If you are having thoughts of harming yourself or of suicide, treat it as an emergency and call or text 988, the Suicide and Crisis Lifeline, or call 911. Depression is highly treatable, and most people who reach out go on to feel like themselves again. Whenever you feel ready, support will be there for you.